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Programming in Java

CBCS BHCS03

By Parul Chachra

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Chapter 31

Introducing Swing

Reference: Schildt, H. Java: The Complete Reference. 7th ediEon. McGraw-

Hill EducaEon

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Top – Level Containers

•  The first are top-level containers:

–  JFrame –  JApplet –  JWindow –  JDialog.

•  These containers do not inherit JComponent

•  They do, however, inherit the AWT classes Component and Container

•  Most commonly used top-level container for applicaEons is JFrame

•  The one used for applets is JApplet.

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Top – Level Containers

•  Features of Top-level containers

•  The top-level containers are heavyweight which makes these containers a special case in the Swing component library

•  A top-level container must be at the top of a containment hierarchy

•  A top-level container is not contained within any other container

•  Furthermore, every containment hierarchy must begin with a top-level container

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Top – Level Containers

•  Each top-level container defines a set of panes

•  At the top of the hierarchy is an instance of JRootPane.

•  JRootPane is a lightweight container whose purpose is to manage the other panes

•  The panes that comprise the root pane are called the glass pane, the content pane, and the layered pane

•  The glass pane is the top-level pane. By default, it is a transparent instance of JPanel.

•  The glass pane enables you to manage mouse events that affect the enEre container (rather than an individual control) or to paint over any other component, for example

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Top – Level Containers

•  The layered pane is an instance of JLayeredPane

•  The layered pane allows components to be given a depth value

•  The layered pane holds the content pane and the (opEonal) menu bar

•  The pane with which your applicaEon will interact the most is the content pane, because this is the pane to which you will add visual components

•  In other words, when you add a component, such as a buVon, to a top-level container, you will add it to the content pane

•  By default, the content pane is an opaque instance of

JPanel.

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Swing Packages

Referensi

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